http://book.klll.cc/ebooks/subject/32055.opds 2025-08-03T06:58:00Z Books about Electric transformers -- History (sorted by popularity) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-08-03T06:58:00Z https://book.klll.cc/ebooks/56365.opds History of the Transformer Friedrich Uppenborn